This title appears in the Scientific Report : 2003 

Intermediate states of a transformation between a quasicrystal and an approximant including nanodomain structures in the Al-Ni-Co system
Döblinger, M.
Wittmann, R. / Gerthsen, D. / Grushko, B.
Mikrostrukturforschung; IFF-IMF
Philosophical magazine / A, 83 (2003) S. 1059 - 1074
London [u.a.] Taylor and Francis 2003
1059 - 1074
Journal Article
Kondensierte Materie
Philosophical Magazine A 83
Please use the identifier: in citations.
Transition states between decagonal quasicrystal and periodic approximants are studied in the Al-Ni-Co system at a measured composition of Al71.3Ni11.3Co17.4 by high-resolution transmission electron microscopy and electron diffraction. The nanodomain structures appearing after annealing at 1270 K show periodic fluctuations coherently embedded in domains with the coarse order of a one-dimensional quasicrystal. Further annealing at lower temperatures changes the features of nanodomain structures and results in an increase in more periodic structures. These can be strongly disordered and full of defects but tiling analysis and electron diffraction patterns show that they correspond to locked phason strain values of two closely related periodic approximants. We conclude that the periodic approximants do not result from a continuous increase in phason strain but from the growth of seeds with a locked phason strain.